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Cover

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In telecommunication, cover is the technique of concealing or altering the characteristics of communications patterns for the purpose of denying an unauthorized receiver information that would be of value.

Note: Cover is a process of modulo two addition of a pseudorandom bit stream generated by a cryptographic device with bits from the control message.

Source: from Federal Standard 1037C and from MIL-STD-188

In philately a cover is an envelope or package, typically with stamps that have been cancelled.

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